A grass fire threatened drivers on Interstate 49 in Springdale Saturday.Springdale firefighters said the fire burned an area about the size of a football field near the Don Tyson Parkway exit.“Our first-arriving crew did a good job,” said Springdale Battalion Chief Blake Holte. “They went straight to that side and started to put the fire out from there.”Firefighters said equipment from a construction crew sparked the blaze. A crew member said wind blew sparks from a torch they were using into the dry grass.“Luckily, they saw the fire start and they were able to move all of their equipment,” Holte said.Holte said firefighters focused on putting out the flames before wind could help the fire grow.The construction crew went home after firefighters extinguished the fire. No one was injured in the blaze.